52 lines
653 B
ArmAsm
52 lines
653 B
ArmAsm
#include "defines.h"
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#ifdef __H8300H__
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.h8300h
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#endif
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#ifdef __H8300S__
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.h8300s
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#endif
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; A0P pointer to cursor
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; A1P thing to copy
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.global _memset
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_memset:
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; MOVP @(2/4,r7),A2P ; dst
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; MOVP @(4/8,r7),A1 ; src thing
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; MOVP @(6/12,r7),A3P ; len
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MOVP A2P,A2P
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beq quit
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; A3 points to the end of the area
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MOVP A0P,A3P
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ADDP A2P,A3P
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; see if we can do it in words
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; by oring in the start of the buffer to the end address
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or A0L,A2L
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btst #0,A2L
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bne byteloop
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; we can do it a word at a time
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mov.b A1L,A1H
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wordloop:
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mov.w A1,@-A3P
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CMPP A3P,A0P
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bne wordloop
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quit: rts
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byteloop:
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mov.b A1L,@-A3P
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CMPP A3P,A0P
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bne byteloop
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rts
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